The answer is to use effective routes for the network interface (NIC). This Azure feature is correct because it reveals the actual, combined routing table applied to a specific VM’s NIC after all route sources—including user-defined routes (UDRs), virtual network gateway propagated routes, and BGP routes—are evaluated using longest prefix match. When traffic from Subnet-App to the internet is unexpectedly routed through a virtual appliance, effective routes directly show which next hop type (e.g., VirtualAppliance or VirtualNetworkGateway) is winning for the 0.0.0.0/0 destination, allowing you to pinpoint the misconfigured UDR. On the AZ-104 exam, this scenario tests your understanding of Azure routing precedence and the fact that a VM’s effective routes may differ from its subnet’s route table due to BGP or gateway propagation. A common trap is checking the subnet’s route table instead of the NIC’s effective routes, which ignores BGP and gateway influences. Memory tip: “Effective routes = the route that actually takes effect on the NIC.”
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Traffic from Subnet-App to the internet is being routed through a virtual appliance unexpectedly. You need to identify which route is being applied to the network interface of VM-App01. Which Azure feature should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Effective routes for the network interface
Effective routes for the network interface (NIC) shows the actual routes applied to a specific VM's NIC after evaluating all route tables, virtual network gateway routes, and BGP routes. Since traffic from Subnet-App to the internet is unexpectedly going through a virtual appliance, you need to see which route (e.g., a user-defined route with next hop type VirtualAppliance or VirtualNetworkGateway) is being selected based on the longest prefix match. This tool directly displays the effective next hop for each destination prefix, allowing you to identify the misconfigured route causing the traffic to be redirected.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Effective routes for the network interface
Why this is correct
Effective routes display the actual routing behavior applied to the VM NIC.
Related concept
Read the scenario before looking for a memorised answer.
✗
NSG flow logs
Why it's wrong here
NSG flow logs show allowed and denied traffic flows, not the effective routing table.
✗
Azure Policy compliance
Why it's wrong here
Policy compliance does not show routing decisions.
✗
The subscription activity log
Why it's wrong here
The activity log records control-plane events, not the effective route entries applied to a NIC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse NSG flow logs (which show traffic filtering) with effective routes (which show routing decisions), leading them to pick NSG flow logs when the question is about path selection rather than security rule evaluation.
Trap categories for this question
Command / output trap
NSG flow logs show allowed and denied traffic flows, not the effective routing table.
Detailed technical explanation
How to think about this question
Effective routes are computed by Azure based on system routes, user-defined routes (UDRs), and BGP routes, with the most specific prefix (longest match) winning. For a NIC, you can retrieve effective routes via Azure Portal, Azure CLI (`az network nic show-effective-route-table`), or PowerShell, which returns the next hop type (e.g., VirtualAppliance, Internet, VNetLocal) and the source of the route (e.g., Default, User, VirtualNetworkGateway). In a real-world scenario, a misconfigured UDR with a 0.0.0.0/0 route pointing to a virtual appliance can override the default internet route, causing all outbound traffic to traverse the appliance unexpectedly.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Effective routes for the network interface — Effective routes for the network interface (NIC) shows the actual routes applied to a specific VM's NIC after evaluating all route tables, virtual network gateway routes, and BGP routes. Since traffic from Subnet-App to the internet is unexpectedly going through a virtual appliance, you need to see which route (e.g., a user-defined route with next hop type VirtualAppliance or VirtualNetworkGateway) is being selected based on the longest prefix match. This tool directly displays the effective next hop for each destination prefix, allowing you to identify the misconfigured route causing the traffic to be redirected.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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